Means for feeding rivets of special section to rivet presses



Nov. 3, 1931. R. A. SKRIBA ET AL 1,829,957

MEANS FOR FEEDING RIVETS ON SPECIAL SECTION TO RIVET PRESSES F'led NOV.'7, 1928 .5 Sheets-Sheet l R. A. SKRIBA ET AL Nov. 3, 1931.

MEANS FOR FEEDING RIVETS ON SPECIAL SECTION TO RIVET PRESSES Filed Nov.'7, 1928 5 Sheets-Sheet 2 Nov. 3, 1931. R. AjsKRlBA ETOAL 1,829,967

MEANS FOR FEEDING RIVETS ON SPECIAL SECTION TO RIVET PRESSES Filed Nov.'7, 1928 5 Sheets-Sheet 5 NOV 3, 1931. R. A. sKRlBA l-:T AL 1,829,967

MEANS FOR FEEDING RIVETS ON SPECIAL SECTION TO RIVET PRESSES Filed Nov.'7, 1928 5 Sheets-Sheet 4 f/Wmwwwjggg R. A. SKRIBA ET AL Nov. 3, 1931.

MEANS FOR FEEDING RIVETS ON SPECIAL SECTION TO RIVET PRESSES 5Sheets-Sheet 5 Filed NOV. '7, 1928 Patented Nov. 3, 1931 UNITEDsfr-arnes? leN einem o'Frie'E-l;

MEANSFORLFEEDING BIVSETSVOF SPECIAL`SECTIONTO RIJIET PRESSES Applicationfiled November This invention relates f toV rivet presses Aor punchpresses equippedwith means for au' tomatically' ,delivering intov the'path of the plungerthe rivets 4havingv a section especially* designed toassume a definite* position in a structural member, vandvhas foritsobject-'to provide means whereby ysuch special rivets, delivered'enmasse to a hopper,.will be caused to issue from the hopperin aparticularposition passedin saidposition to'a positioninfr u) 7 b slideby which they are spotted in the place of use, and thereby retaineduntil assembled with the structuraliiieniber in readiness'to be Asecuredtherein by the descent of the press i plunger. Another object istoprovide means whereby rivets,` feedingk from a container where theyare conined en masse, are made to assume poi sitions en train with theircharacteristic pro- I 0 files at a predetermined'angle of horizontalrotation, towhich end, another kfeatureof the invention consistsfinproviding the container with a rotary selector, subdivided intoradialspaces proportioned to receive therivets only 5 when they are in thepredeterminfe'd.position,` and preventing the entra-nce'of rivets not insuoli position'. Y

Another object is to provide automaticallyI releasing drive meansor'such -a feeder and 30 one in which the drive of the feed, incase arivet assumes a position across the dividingr plane between thestationary and rotating parts of the eeder,'vvill yield underthecholting of the rotary member to avoid breakage,

siand therotary member will Vreceive a slight,v retrogrademovementsuflicieiit to release the gripped rivet and permit the rivet tocontinuef its movement toward thevplace of use and out ofobstructingposition.

In vthe accompanying drawings, in which the preferred embodiment oftheinvention is shown -by way of'illustration-- Figure 1 isa sideelevation oftheprincipal 5 operation ofa riveting :pressin whichthewin-` vention is embodied.

Figure'2 is a viewsimilar to lFigurel but on an enlarged Vscale and with`omission` ofthe 1 rivet-supplying means" and the driving mech# 5o anismof the press.

7, 1928."'Seia1 No.` 317,859.4v

.Figure 3is a front-'view ot parts .shown in@v Figure2. Fignrell is aplan viewoffpartsshown in v Figures 2 andl, portions above the rplane`of thefworlz table EAbeing omitted# 55 Figure 5 isa top plan-view, andFigure anV axiali section l `on 'line E606-6m iny Figure. l5 j Vsupplychuteg 41a hopper forvfeedingvrivetslqo to saidchute; 5 a rivetingdie,`-6 a pressplung er, 7 a main shaft, 8 the' lylwhe'el-of thepress,-V and v9 Athehopper basel rin fa rivetingpress,"

which parts, so; f-arlas Ienumerated and exceptl4asfhereinafterddentiiied more in detail may 75 followknownfconstruotio'n, oriat least cor-V respond J'in 'construction andoperationV with similarparts disclosed in our: application,

HopperY base 9 is'ff rotatably mounted1 30 ,throng-hf means ofV shaft1V110 fin' `a bracket 11, y Vand -throughmeans of anvintegra'lsector l2having slot-13 and bolt 141,'mayl be'iiXedi-with said base atY an'appropriate angleto the'horiw zontalv to fcausevthe rivets in the*hopperl to .S5 gravitatertowardfthe discharge sidel-ofvthe hopper; fasisA also described) in our copending f application `referred to;vv Shafthas mounted upon it a driving ratchet 15 and pawl' 16 pivotally mountedon ,90

arinl? that is oscillatedthrough pitman 18 from crank 19 on fshaftlQOwhich is constantly driven during the interinittentdriving of the'shaft7 Tliiis thermotor M through the shat and belt 24 rotates the pulley 23495 which, inturn', throu'glrreduction gears 21; 21, rotates"continuously the shaft 20'. The fly-wheelS Vis drivenfconstantly'`bythe belt 26 which 'leads from the shatQ; and the flywheel,- lbymeans. of a suitable clutch mechanism (not shown), imparts intermittentmotion to the shaft 7, such intermittent motion being controlled bymeans of a foot treadle or other suitable device.

Ratchet 15, as may be seen from Figures 5 and 7, is composed of aplurality of plates spaced apart by means of an inserted washer, andcomprises two sets of teeth, namely, teeth 27, having rearwardlypresented faces 28 engaged by forward driving dog 29 to impart a forwardstep to the rotation of the ratchet and consequently to movable parts ofthe hopper 4 on each stroke of the crank 19 and teeth 30, havingrearwardly presented faces 31 engaged by the dog 32 that is rigid withthe pawl 16 imparting a slight retrograde movement to the ratchet ateach stroke of said crank. Both the dog 32 and the dog 29 have pivotalaction about the center 33 on the outer end of the oscillating arm 17,dog 32 being held to its dut-y by means of spring 34, and the dog 29being controlled by gravity. It is to be observed from an inspection ofFigure 1 that the dog 32 is governed in its movement by engagement withthe pit-man 18. rTooth faces 28 and 31 are at such circumferentialdistances apart on the periphery of the ratchet 15 that on the forwardstroke of the pawl 16, dog 29 will impart a full forward stroke of theratchet and the parts which it drives commensurate with the throw of theoscillating arm 17, but the dog 32, which at the beginning of suolimovement is in engagement with a face 31, will by the engagement of itslifting pin 35 with the rod 18 be given an upward movement on center 33suicient to release tooth 30, which is for the time being engaged by thedog 32, so that the end point of the forward drive under the dog 29, byreason of the continued gravitation of said dog 29 into engagement withits tooth face 28, will be sufficient to put face 31 in advance of thedog 32; and then on the return movement of rod 18, dog 29 rides upon theincline of the tooth with which it has been engaged until it dropsbehind the next ensuing face 28; but toward the end of the returnstroke, dog 32 will have engaged the next ensuing face 31 and imparted aslight retrograde movement to the ratchet sufficient to release any gripthat may have occurred between the stationary and revolving members ofthe hopper to be described.

in addition to the features described, ratchet 15 has a slip driveconnection with the shaft 10 provided by any approved form of frictionalclutch faces 36 (Figure 5), so that in case the rotating member withinthe hopper 4 becomes positively chocked by the grip of a rivet betweenrotating and stationarv parts. breakage will be avoided.

ltefeiTingv now to Figures 5 and 6, 37 represents a spider rotating witha vertical shaft 38, which is driven by spiral gear 39a that is keyed tothe shaft, as shown. rIhe gear 39a is rotated by a second spiral gear 39which is mounted upon the shaft 10. The spider carries agitators 40within the hopper that keep the mass of rivets stirred up, and alsocarries the hopper wall 4, so that the hopper likewise rotates with theshaft 38. Shaft 38 is also made to rotate a selector 41 since the latteris rigidly connected with the bottom of the rotating hopper 4. Theselector is equipped within its perimeter with radial partitions 42 thatform pockets 43 that become filled with the rivets as the selectorrotates, receiving the rivets however only in a definite position forthe reason that each rivet X, as will be seen in Figure 5, has a flatface X and the distance between the partitions is less than the fulldiameter of a rivet, so that no rivet can enter except it be at an angleof rotation which presents its minor diameter transversely of the pocketformed between two partitions. By rotation of the selector 41, therivets enter the chute 3, as shown, and will keep the chute filled sothat a fresh rivet is presented at the lower end of the chute as fast asau antecedent rivet is used.

its shown in Figure G, chute 3 is mounted at its upper end in thestatioi'lary base 9 of the hopper. If, in the feeding of the rivets, arivet should come into the position shown in Figure 5, in which itcrosses the plane between the rotating selector 41 and the nonrotatingbase 9, the frictional clutch 36 will yield and avoid breakage thatwould otherwise occur by the checking of the selector, but since duringthe idling movement of the hopper drive, which. would result from suchslippage, the press will have used up another rivet, the column willhave advanced to clear the obstruction and the feeding operation will beresumed as intended. In order to avoid gripping an obstructing rivet inthe position referred to. the slight retrograde action in the ratchet 15comes into play on each return stroke of the arm 17 as alreadydescribed, and this slight picking up movement releases the rivet.

In the lower end of the chute 3 the rivets are delivered into a slideway44 in which is mounted the positioning slide 45 that spots the rivets,as shown at the point X in Figure 4. In arriving in front of thepositioning slide 45, each rivethas traveled with its flat face againstone side of the chute 3, the chute being of less width than the majordiameter of the rivets, and the rivets reach the slideway with theirflat faces presented toward the front of the machine, which is theposition that they are desired to assume in their assembly with thestructural member (indicated at Y in Figures 1 and 2). In order toprevent displacement of the rivets from this position of rotation in theinterim between leaving the chute 3 and entering the slideway 44, alinger 46, shown in dotted lines in Figures l and 2 and in plan View inlll lli

V this end, the finger 46 forms one end of a bell crank lever of whichthe other arm, as shown at 50, is provided with a slot through whichextends a vertically movable rod 49 having its upper extremity securedto the plunger 6. Compensating springs 51 and 52 may be provided at thebottom and top, respectively, of the rod 49, and the lower compensatingspring 51 is adapted to engage the arm 5() of the bell crank lever andmove that arm upwardly, and hence the arm 46 forwardly, upon downwardmovement of the plunger 6, at approximately the same rate of speed asthe slide moves in advancing the rivet. Thus, during the early movementof the .finger it is pushed by the rivet, but when about one half of thestroke has taken place, the spring 51 engages the arm 50 and drives thefinger 46 slightly in advance of the rivet. As the rivet approaches thelimit of its forward travel, the end of the finger 46 passes beneath thelower plane of the positioning slide and remains in a concealed positionuntil the slide commences to recede, whereupon the rod 49 commences todescend and the finger 46 moves rearwardly independently of the slideand at approximately the same rate of speed until it finally comes torest in the position shown in dotted lines in Figure 2. It will beunderstood that by means of such a provision, the finger 46 ispositively controlled in its movement by mea-ns of the rod 49, and withthe exception of the first part of its stroke forward, is advanced orretarded independently of the slide or the rivet which is moved bytheslide. The upper compensating spring 52 is confined to its p0rtion ofthe shaft 49 by the nuts 53 and a part 54 secured to the plunger 6,which part abuts the lower end of the spring.

Inasmuch as the positioning carrier 45 is always at its forward limitwhenever the plunger 6 is elevated, the rivet which it spots will beheld in position while the structural member Y is being maneuvered tobring its prepared opening over the rivet; and during the rivetingstroke when the positioning carrier recedes, the rivet, which is nowengaged by the structural member with the flat face of the rivet againstthe offset in the structural member which necessitated the use of thespecial design of rivet, will be firmly held in position to receive theupsettingend of the riveting die 5.

After riveting is complete, the work is kicked out, preferably by meansalready del scribed in connection with ourcopending ap? plicationhereinbefore identified, and which! consist generally of a pair of rods55 normally depressed by springs 56, but adapted to be elevated intolifting engagement with the structural member Y on each upstroke of thepress, for instance, through means of lever 57 pivoted at 58 and engagedby pick-up hook 59 which is drawn upward through means of rod 60 mountedat its upper endrin bracket 61 on the plunger 6.

The means for imparting timed forward impulses to the positioningcarrier 45 is likewise disclosed in our copending application andconsistsof bell crank lever 62 fulcrumed at 63, moved in the forwarddirection by spring 64 and in the rearward direction by cam 65 mountedVon the plunger 6, and cooperating with the anti-friction roller 66 onthe bell crank lever.

We claim: 4

1. In means for feeding rivets to a rivet press, a hopper having adischarge opening, a selector moving in said hopper to bring rivets tothe discharge opening, and means moving said selector, normally having aretrograde movement in addition to a forward movement; the retrogrademovement alternating definitely with the forward movement, but beingmaterially less in amplitude than the forward movement.

2. In means for feedin' rivets to a rivet press, a hopper having adischarge opening, a selector moving in said hopper to bring rivets tothe discharge opening, and means for moving said selector, having aretrograde movement in addition to a forward movement; the driving meansincluding a ratchet and two dogs, one of which acts forwardly on theratchet and the other of which acts rearwardly thereon.

3. In means for feeding rivets to a rivet press, a hopper having adischarge opening,

